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Composite particle composed of activated carbon and graphene hybrid, preparation method and application

A technology of activated carbon particles and composite particles, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. , The effect of improving electrical conductivity and shortening processing time

Active Publication Date: 2018-04-10
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon has many micropores, and the substances adsorbed in the micropores are not easy to desorb, which limits its scope of use.
At the same time, carbon nanomaterials have many mesopores, and the adsorbed substances are easy to desorb, but they are light in weight and have large volume changes during the process of adsorbing liquids, making it difficult to realize engineering
At the same time, carbon nanomaterials are small in size and are easily taken away in the process of contacting liquid or gas, resulting in loss. New fixing and forming methods are extremely needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Graphene hybrid (graphene mass fraction is 70%, all the other are carbon nanofibers, bulk density is 300kg / m 3 , the specific surface area is 1600m 2 / g) Grind for 0.1 hour in a grinding device filled with water to form a slurry; the activated carbon particles (average particle diameter is 0.1 micron. Bulk density is 100kg / m 3 , the specific surface area is 3000m 2 / g) added in the above-mentioned slurry, and ground for 3 hours at a rotating speed of 4000 rpm to form a paste (wherein the mass fraction of graphene hybrids is 10% based on the dry powder mass of carbon).

[0026] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form a composite particle with an average particle diameter of 5 microns (the specific surface area of ​​the composite particle is 2700m 2 / g, the bulk density under 1MPa pressure is 500kg / m 3 , surface conductivity is 40S / cm). The fine powder less than 5 ...

Embodiment 2

[0029] Graphene hybrids (graphene mass fraction is 51%, all the other are 35% carbon nanotubes and 14% nano carbon particles, bulk density is 250kg / m 3 , the specific surface area is 600m 2 / g) Grind in a grinding device filled with water for 3 hours to form a slurry; the activated carbon particles (average particle diameter is 10 microns. Bulk density is 530kg / m3, specific surface area is 2500m 2 / g) added in the above-mentioned slurry, grinded for 10 hours at a rotating speed of 20 rpm to form a paste (wherein the mass fraction of graphene hybrids is 20% based on the dry powder mass of carbon).

[0030] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form composite particles with an average particle diameter of 15 microns (the specific surface area of ​​the composite particles is 1531m 2 / g, the bulk density under 1MPa pressure is 580kg / m 3 , surface conductivity is 100S / cm). The f...

Embodiment 3

[0033] Graphene hybrid (graphene mass fraction is 90%, all the other are carbon nanotubes, bulk density is 200kg / m 3 , the specific surface area is 1800m 2 / g) Grind for 0.1 hour in a grinding device filled with organic liquid NMP to form a slurry; the activated carbon particles (the particle average diameter is 20 microns, and the bulk density is 720kg / m 3 , the specific surface area is 2200m 2 / g) add in above-mentioned slurry, grind 3 hours under the rotating speed of 2000 rev / mins, form paste (wherein the massfraction of graphene hybrid is 5% by the dry powder mass of carbon).

[0034] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form a composite particle with an average particle diameter of 20 microns (the specific surface area of ​​the composite particle is 2180m 2 / g, the bulk density under 1MPa pressure is 700kg / m 3 , surface conductivity is 10S / cm). The fine powder less t...

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Abstract

Composite particles composed of activated carbon and graphene hybrids, preparation methods and applications, the composite particles include activated carbon and graphene hybrids, wherein the mass fraction of graphene hybrids is 1-20%, and the average particle size of the composite particles is 5-100 microns; the structure of the two is that graphene hybrids are wound around and on the surface of activated carbon particles; the specific surface area of ​​the composite particles is 600-2700m2 / g, and the bulk density under 1MPa pressure is 500-800kg / m3, The surface conductivity is 1-100S / cm; the invention also discloses the preparation method and application of the composite particle; the composite particle can be used as a gas adsorption material or a liquid hydrocarbon adsorption material, and can also be used as an electrode material for a supercapacitor , providing both a good conductive path and capacity.

Description

technical field [0001] The invention belongs to the technical field of composite particles and their preparation, and in particular relates to a composite particle composed of activated carbon and graphene hybrids, a preparation method and an application. Background technique [0002] Activated carbon is a class of SP 3 The material composed of hybrid carbon and having a large specific surface area is currently the electrode material of organic liquid-based supercapacitors, which can work at 2.7-3V, so that the energy density of supercapacitor-based devices can reach 6-7Wh / kg. Recently, due to the rapid development of the supercapacitor market, supercapacitor products with higher power density are required. However, the conductivity between activated carbons is poor. Although there are nano-carbon particles such as super P, the conductivity is still a bottleneck at large charge-discharge rates. [0003] Carbon nanomaterial is a new type of material with large specific surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/38H01G11/24H01G11/86
CPCY02E60/13
Inventor 骞伟中谢青余云涛魏小波田佳瑞张强魏飞朱贤麟
Owner TSINGHUA UNIV
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